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+# Directory structure
+
+GitBook uses a very simple and obvious directory sttructure:
+
+```
+.
+├── book.json
+├── README.md
+├── SUMMARY.md
+├── chapter-1/
+|   ├── README.md
+|   └── something.md
+└── chapter-2/
+    ├── README.md
+    └── something.md
+```
+
+An overview of what each of these does:
+
+| File | Description |
+| -------- | ----------- |
+| `book.json` | Stores [configuration](config.md) data (__optional__) |
+| `README.md` | Preface / Introduction for your book (**required**) |
+| `SUMMARY.md` | Table of Contents |
+
+
+### Static files and Images
+
+A static file is a file that is not listed in the `SUMMARY.md`. All static files, not [ignored](#ignore), are copied to the output.
+
+### Ignoring files & folders {#ignore}
+
+GitBook will read the `.gitignore`, `.bookignore` and `.ignore` files to get a list of files and folders to skip.
+The format inside those files, follows the same convention as `.gitignore`:
+
+```markdown
+# This is a comment
+
+# Ignore the file test.md
+test.md
+
+# Ignore everything in the directory "bin"
+bin/*
+```
+
+### Project documentation / Sub-directory {#subdirectory}
+
+For project documentaiton, it sometimes better to use a diretcory (like `docs/`) to store the prject's documentation. You can use a `.gitbook` file to indicate to GitBook in which folder the book is stored:
+
+```
+.
+├── .gitbook
+└── docs/
+    ├── README.md
+    └── SUMMARY.md
+```
+
+With `.gitbook` containing:
+
+```
+./docs/
+```